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The Journal of Neuroscience, July 14, 2004, 24(28):6248-6257; doi:10.1523/JNEUROSCI.0985-04.2004
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Development/Plasticity/Repair
Src Family Kinases Are Involved in EphA Receptor-Mediated Retinal Axon Guidance
Bernd Knöll and
Uwe Drescher
Medical Research Council Centre for Developmental Neurobiology, King's College London, London SE1 1UL, United Kingdom
EphA receptor tyrosine kinases and their ephrin ligands play important roles in wiring of the developing nervous system. We have investigated here the function of Src family kinases (SFKs) in the retinotectal projection to dissect the signaling pathways by which EphA receptors control actin/microtubule rearrangements that underlie growth cone guidance and collapse. Both EphAs and SFKs are expressed broadly in retinal growth cones, and SFKs are recruited to EphA receptors after ephrinA stimulation. In the stripe and growth cone collapse assays we observe an abolition of EphA-mediated repulsion after inhibiting SFKs, either pharmacologically or enzymatically via electroporation-mediated overexpression of the SFK inhibitor Csk. In addition, we identify cortactin and the RhoGEF ephexin, which interact with EphA receptors in retinal axons, as targets of SFK-dependent tyrosine phosphorylation. In sum, our data suggest an important role of SFKs as downstream signaling molecules in EphA receptor-mediated repulsive axon guidance.
Key words: retinotectal projection; axon guidance; Eph family; Src family kinase; intracellular signaling; actin cytoskeleton
Received March 17, 2004;
revised May 25, 2004;
accepted May 25, 2004.
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